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Prevent knockout by using the Overprint options in the Attributes panel in InDesign.
How to force black to overprint background.
Solved: Want to export a PDF with Simulate Overprint - Adobe
print design - InDesign: knockout / overprinting - Graphic Design
The Best Method for Setting Up Overprint in Adobe InDesign — Fraga Graphic Solutions, LLC
The Best Method for Setting Up Overprint in Adobe InDesign — Fraga Graphic Solutions, LLC
Over printing problems and solutions in Quark, InDesign and
What is Overprinting & Overprint Preview in InDesign?
Solved: Re: QR Code overprint. - Adobe Community - 9706681
Overprint Knockout
Over printing problems and solutions in Quark, InDesign and
Overprint is Not Honoured in Non PDF/X Compliant PDF Files When
Solved: Overprint black text turning to knockout during PD - Adobe Community - 13590697
Turn on Overprint Preview Before Printing